Rhododendron yakushimanum Porzellan
Rhododendron yakushimanum Porzellan
Rhododendron yakushimanum Porzellan
Yakushima Rhododendron, Yakushimanum Rhododendron
A measured comment because the label attached to the young plant doesn't match the one stuck on the pot. Customer service tells me I should trust the second one. I hope so - they're not at all the same colours, nor the same orders of magnitude!!
SHINRA TENSEI, 22/11/2025
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Description
Rhododendron 'Porzellan' is a particularly floriferous hybrid derived from the Japanese species yakushimanum, which has given it a compact habit. Its flowering in April-May is a delight for the eyes: clusters of pink buds open into campanulate flowers of porcelain white colour, with yellow-green macula. The evergreen dark green foliage adorns its branches, whose stout architecture evokes Japanese art. An award-winning variety in England by the RHS that is interesting even outside of flowering.
Rhododendrons are plants of the Ericaceae family, just like heathers, preferring predominantly limestone-free, acidic soils and humid climates. Rhododendron yakushimanum 'Porzellan', sometimes encountered under the name 'Hachmann's Porzellan', forms a dense bush with a rounded, sometimes slightly spreading habit, reaching about 80cm (31.5in) in all directions when mature. Its growth is rather slow, generally reaching 60cm (23.6in) at the age of 10. Its evergreen leaves, dark and matt green, are elliptical in shape and cover the plant well. They have a very velvety, reddish-brown underside. In April-May, its remarkably abundant flowering submerges the bush: grouped in corymbs, the pink floral buds open, revealing large flowers of pure white colour, adorned with a spotted yellow-green macula.
Like all yakushimanum hybrids, affectionately nicknamed "rhodos yak" by specialists, Rhododendron 'Porzellan' is hardy down to -15 °C or even -20 °C. Although they prefer a semi-shaded exposure, these hybrids can tolerate the sun as long as it is not scorching and their base remains cool. 'Porzellan', with its abundant and luminous flowering, will easily adorn a small shaded space in the garden, in the company of Ferns, blue or variegated hostas, Pieris, Heathers, Kalmias, Azaleas and Japanese Maples, or other rhododendrons of the same group to create superb patchworks of textures and colours in spring. Growing in containers requires regular watering with non-limestone water and specific fertilizer for acid-loving plants.
Rhododendron yakushimanum Porzellan in pictures
Plant habit
Flowering
Foliage
Planting and care
Plant Rhododendron yakushimanum 'Porzellan' in a semi-shady position, protected from cold and drying winds, in a fresh, humus-rich and light soil, with a tendency towards acidity or neutrality. Like all heathland plants, it cannot tolerate chalky soils or heavy soils that become waterlogged in winter. If the soil remains moist in summer, this rhododendron can also tolerate a non-scorching sunny exposure.
Dig a hole three times larger than the pot. Soak the root ball in non-chalky water and plant the bush at the level of the collar, in a mixture composed of 1/4 turf, leaf compost, gravel or pumice, and loam. Water generously and keep the soil moist in summer. Azaleas and rhododendrons have a shallow root system. Therefore, they are susceptible to long periods of drought. That is why a humus-enriched soil and abundant watering during dry periods are recommended. Additionally, this root system is not very strong, which is why it is essential to lighten heavy soils with draining materials (gravel, pumice, clay pebbles) when planting. Apply a mulch of shredded pine bark around the base of the bush every spring to maintain soil moisture and acidic pH.
Maintenance consists of removing faded flowers in summer and cleaning the bush of dead branches. Azaleas and rhododendrons can sometimes be attacked by weevils, which eat the edges of leaves and rootlets, as well as the famous "rhododendron beetle," which rarely causes severe damage. Effective biological solutions are now available against weevils. Yellowing of the leaves (chlorosis) in rhododendrons indicates poor assimilation of iron in the soil and can lead to premature death of the plant. While limestone is often the cause, poorly drained soil or a deeply planted root ball can also explain the phenomenon.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
The flowering period indicated on our website applies to countries and regions located in USDA zone 8 (France, the United Kingdom, Ireland, the Netherlands, etc.)
It will vary according to where you live:- In zones 9 to 10 (Italy, Spain, Greece, etc.), flowering will occur about 2 to 4 weeks earlier.
- In zones 6 to 7 (Germany, Poland, Slovenia, and lower mountainous regions), flowering will be delayed by 2 to 3 weeks.
- In zone 5 (Central Europe, Scandinavia), blooming will be delayed by 3 to 5 weeks.
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The planting period indicated on our website applies to countries and regions located in USDA zone 8 (France, United Kingdom, Ireland, Netherlands).
It will vary according to where you live:
- In Mediterranean zones (Marseille, Madrid, Milan, etc.), autumn and winter are the best planting periods.
- In continental zones (Strasbourg, Munich, Vienna, etc.), delay planting by 2 to 3 weeks in spring and bring it forward by 2 to 4 weeks in autumn.
- In mountainous regions (the Alps, Pyrenees, Carpathians, etc.), it is best to plant in late spring (May-June) or late summer (August-September).
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
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